Typewriting-machine-cushioning foot



M. c. cRAwLEY TYPEWRIHNG MAHINE cmsHIQNINGz v.F901 1 Filed July 25',1922 V TOR BY 'ATTORNEYS 6 Hum Planted Dsc. s, i925.

UNITED STATES `1,564358- PATENT oFFicE.

mslm!) C. ORAWLEY, OF GBOTON, NEW YORK, ASSIGNOB TO ADDOGBAPH OOK- PANY,OF LOS ANGELES, CALIFORNIA, A CORPORATION Ol' CALIFORNIA.

' TYPEWBITING-HACHINE-OUBHIONING FOOT.

Application tiled July 25, 1922. Serial No. 577,383.

To a whom t may concem:

Be it known that I, MANsFinw C. Caswmzr, a citizen of the United States,and resident of Groton, in the county of Tom kins and State of New York,have invente certain new and useful Improvements in Typewritin-Machine-Cushioning Feet (case No.

), o which the following is a specification.

This invention has special reference to ty writing machines in that itis especially clicicious, when yused on those machines, in

destroying the vibrations and noise resulting from the operation of themachine; but l5 it will be understood that the invention is applicableto other machines in which it is desirable to accomplish the samepurpose.

In the drawing annexed, Fig. 1-is aside elevation of one corner of atypewmting. ma-

90 chine frame having one of my cushion feet attached thereto; v Fig. 2is a vertical sectional view of the same;

Fig. 3 is a bottom view of the saine;

25 Fig. 4 is a sectional view on the line 4 4 of Fig. 2, looking upward;and

Fig. 5 1s a perspective view of the rubber pad and its cap plate, thetwo parts being se arated for better illustration.

eferring to the various parts by reference characters, 10 designates apart of a typewriting machine frame, the under side of which is providedwith a cylindrical pocket, up into which extends the upper en'd 85 of acoil spring 11. The lower en of this coil spring presses against ,a capplate 12 having a central upstanding circular lug- 13 which fits withinthe lower end of the spring and tends toy center the same with referenceto the aforesaid cylindrical pocket in the machine frame.

This cap eplate has a marginal, downwardly-turn flange 14 which forms acuplike receptacle :for a soft rubber padv block 4s 15, the upper end ofthis pad block fitting tightly within the flange 14 and abutting againstthe under side of the body of the cap p ate, At veach side of thecentral lug 13 the ca 'plate is provided with a` hole, and

5o the ru ber pad is provided' with a registering hole and-through theseregistering holes is passed upwardlyV a'screw 16 -whose upper end isinto the machine frame at a point y adjacent-to theella the lower'end ofthe-screw being .provided with a -head which is housedA in a ocket 17formed in the under side of the ru ber pad, said head engaging thebottom surface of the pocket so as to thereby prevent the pad and itscap plate from being'pushed off the end of the screw by the action ofthe spring 11. It will be observed that the ressure of the spring 11against the cap p ate forces the ad against the heads of the screws,these hea s serving, therefore, to restrict the downward limitedmovement of the pad. These two screws also serve to prevent the pad fromhaving a rotative action, thereb insuring the centering of the lug. 13withI reference to the spring-pocket in the frame. The pockets 17 varemade suliciently deep topermit a considerable compression of the pad andspring without bringing the heads of the screws into contact with thesupport on which the machine rests. v

In actual tests I have found .that the use of a metallic coil sprin incombination with a support-engaging ru ber pad is very efficacious indissipatin the usual vibrations and sounds produced y the operation of atypewriting machine, the rubber pad serving to almost completelydissipate whatever sounds and noises may be transmitted through thesprin to the cap plate of the pad. It will be ogbserved also that by theuse ofa metallic coil spring to take up what' might be called theprimary vibrations, deterioration of the rubber pad (which, of course,is inevitable) will not materially aiect the eiciency of my device as asound deadener. It will be observed thatA the tension of the sprin 11may be readilyadjusted by adjusting e screws 16 in the A frame. It 'willbe observed also that it is desirable that the screw'4 holes inthe capplate 12 shall be slightly larger than the y screws, in order toavoid ascraping contact therewith, and further that the screw holes vin the padshall be sli htly smaller than the screws so that the pa will firmly aspthe screws and thus avoid lateral oscil ations of I the machine frame,.except .such as result' from yieldin ofthe pad. Y.

The leng'tg of serewsl and spring *11, and the of .said spring, are suchthat the 'loWr-*dge fof the frame vis normally yieldahlymaintainedy'well above the top of cap plate. 12., as shwnpiifrlfigalhla'nd 2.

considerable' compressionff L the spring"witl iout the framestrikingthe" i'l'o recesses formin cap plate, whereby violent shocks inhandling or transportation of the machine will be absorbed and thetypewriter mechanism` stantially deeper than the thickness of the screwheads and the up er walls of the cushion a utments adapted to be engagedy the screw heads to limit upward movement of the frame relatively tothe foot, a metal cap attached to the upper end of the foot having acentral pro]ec tion in register with the recess 1n sa1d frame andapertures adjacent said\ pro]ect1on through which the screw Shanksextend, and

an upright coiled springhaving its upper end seated in the recess intheframe and its lower end seated on the cap andv sur# rounding theprojection and normally supporting the frame above the cap with theheads of the screws above the bottom of the foot.

' 2. In a typewriting machine the combination of a main frame, a rubbersupport- `ing foot for the frame having a pair of sockets in its lowerface and a pair of vertical passa es leading from said sockets 'to theup er ace of the foot, a metal top plate secured) on the upper end ofthe foot, an

. of the upstanding coil s ring seated on said .plate and engagin witthe frame at its upper end, a pair o rigid vertical members dependingfrom the frame and secured thereto at their upper ends, said membersextending 4b down t rough the passages in the foot in sliding frictionalengagement with the -walls passagesl and provided at their lower endswith heads normally disposed above the lower face of the foot in saidsockets' and so adaptedV to engage the top walls of the sockets to limitupward movement of the frame relatively. tothe foot, said top platehaving openings through whichsaid vertical members extend registeringwith the pas- 65 sages and larger than the ends of the passages so thatthe edges of theapertures4 are out of contact with the vertical members,and cooperating means on the main frame and top plate for maintainingsaid coil spring in an upright position over the center of the footbetween said pair of ver( tical members. v

3. In a device of the class set forth, a

machine frame having a pocket opening downwardly, a coily spring havingits upper part enclosed in said ocket, a foot pad consisting of varubber b ock and a cap ate aflxed thereto and being provided wit anupstanding lug entering the lower end of said spring, said rubber blockhaving two pockets formed in its under side, and aI air of screwsextending up through the ru ber block and the ca plate and tapped intothe machine frame, t e heads of said screws. be-

ing housed in said pockets formed in the rubber block.

In testimony 'whereof I hereunto aix my signature.

MANSFIELD C. CRAWLEY.

